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## Op-Amp Inverting amplifier vs Non inverting amplifier | Difference between Inverting amplifier and Non inverting amplifier

This page compares op-amp inverting amplifier vs non inverting amplifier and mentions difference between Inverting amplifier and Non inverting amplifier. These are op-amp circuits.

### Op-Amp Inverting Amplifier circuit The figure-1 depicts inverting amplifier circuit made using standard Op-Amp chip.

As shown in the figure , the input voltage which need to be amplified (DC or AC) is applied to inverting (-) terminal via resistor Rin. Due to this, the output is in anti-phase with the input. Hence it is known as inverting amplifier. The non inverting (+) terminal goes to 0 volt.

The negative feedback is provided by Rf (feedback resistor). This feedback resistor feeds back fraction of the output voltage to the inverting terminal.

The gain of this inverting amplifier circuit is expressed by following equation:
G = Vout/Vin = -Rf/Rin
Where Rf is the feedback resistor and Ri is the input resistor used in the Op-Amp.

### Op-Amp Non inverting Amplifier circuit The figure-2 depicts non inverting amplifier circuit made using standard Op-Amp chip.

As shown in the figure, input voltage (DC or AC) is applied to non-inverting terminal of the Op-amp. This will generate output voltage which is in-phase with the input voltage. Hence it is known as non inverting amplifier.

Negative feedback is applied by feeding fraction of the output voltage to the input (-) terminal.

The gain of this non inverting amplifier circuit is expressed by following equation.
G = Vout/Vin = 1+(Rf/Rin)
Where Rf and Ri are feedback resistor and input resistor respectively.